[LLVMbugs] [Bug 18482] New: Bad alignment in convertUTF16ToUTF8String

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18482

            Bug ID: 18482
           Summary: Bad alignment in convertUTF16ToUTF8String
           Product: libraries
           Version: trunk
          Hardware: Sun
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Support Libraries
          Assignee: unassignedbugs at nondot.org
          Reporter: stoklund at 2pi.dk
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

lib/Support/ConvertUTFWrapper.cpp contains this code:

bool convertUTF16ToUTF8String(ArrayRef<char> SrcBytes, std::string &Out) {
  ...
  const UTF16 *Src = reinterpret_cast<const UTF16 *>(SrcBytes.begin());
  const UTF16 *SrcEnd = reinterpret_cast<const UTF16 *>(SrcBytes.end());
  ...
  if (Src[0] == UNI_UTF16_BYTE_ORDER_MARK_SWAPPED) {

The UTF16 type is normally 2-byte aligned, and there is no guarantee that the
ArrayRef points to aligned bytes.

This crashes the unit test ConvertUTFTest.ConvertUTF16LittleEndianToUTF8String
on SPARC.

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